When should the a/p disconnect? I guess that is less about raw technology as the nerve of manufacturers safety engineers, pilots unions or the press (pilot error, particularly in difficult circumstances, is usually graciously forgiven, computers never!). For a peep at the future of the a/p and FBW try:-
Rockwell Shows Off Self-Healing UAV | AVIATION WEEK
or
Flying on a Wing and a Half - Defense News
…. although I guess that software would have had a hard time without attitude data or perhaps airspeed data!